Case component of transaxle

Abstract

A case component of a transaxle includes: a bearing unit having a through-hole through with a shaft member is to be inserted; a matching surface unit having a matching surface on which another member is to be overlapped; bolt hole portions formed on the matching surface unit; bent wall portions, each having a V-shaped or U-shaped cross-section cut in a direction orthogonal to a straight line connecting a shaft center of the bearing unit and a shaft center of the bolt hole portions, each having a valley portion positioned on the straight line, and connecting the bearing unit and the respective bolt hole portions; and V-shaped portions, connected with the respective bent wall portions, provided on an outer circumference of the respective bolt hole portions, and protruding toward the bearing unit.

What is claimed is: 
     
       1. A case component of a transaxle comprising:
 a bearing unit having a through-hole through with a shaft member is to be inserted; 
 a matching surface unit having a matching surface on which another member is to be overlapped; 
 bolt hole portions formed on the matching surface unit; 
 bent wall portions, each having a V-shaped or U-shaped cross-section cut in a direction orthogonal to a straight line connecting a shaft center of the bearing unit and a shaft center of the bolt hole portions, each having a valley portion positioned on the straight line, and connecting the bearing unit and the respective bolt hole portions; and 
 V-shaped portions, connected with the respective bent wall portions, provided on an outer circumference of the respective bolt hole portions, and protruding toward the bearing unit. 
 
     
     
       2. The case component of a transaxle according to  claim 1 , further comprising:
 curved surface wall portions provided between the adjacent bent wall portions, and formed into a curved surface shape constituting a general surface from the bearing unit to the matching surface unit, 
 wherein cross-sections of the curved surface wall portions on planes including respective straight lines extending from the shaft center of the bearing unit toward the matching surface unit and an axis line of the bearing unit have an arc shape of a true circle at any position of the curved surface wall portions in directions orthogonal to the direction of the axis line of the bearing unit. 
 
     
     
       3. The case component of a transaxle according to  claim 1 , further comprising: ribs extending along respective rims of the bent wall portions. 
     
     
       4. The case component of a transaxle according to  claim 1 , further comprising: ribs extending from a shaft center side of the bearing unit toward a shaft center side of the bolt hole portions on respective protruding portions of the bent wall portions.